When we upgraded to the new Symantec Endpoint Protection 11 security software, we kindof uninstalled everything in the wrong order. Maybe. I didn't read the instructions well enough or I did read them well enough and this was never mentioned, but if you uninstall the centralized management software before removing the software from all the clients and you required an uninstall password, then you'll be unable to uninstall the software from the clients because it's attempting to contact the centralized management server when it no longer exists.

Long sentence short: Through genius design or engineering oversight, this is easily remedied by changing the following registry key, a DWORD, from a "1" to a "0": HKEY_LOCAL_MACHINE\SOFTWARE\Intel\LANDesk\VirusProtect6\CurrentVersion\
AdministratorOnly\Security\UseVPUninstallPassword. Change that from a one to a zero and retry the uninstall; for me it's worked each of the seven times I've had to use it.

-Some Rando